package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.thoughtworks.xstream.XStream;

public class ContactDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length <3) {
			System.out.println("Please specify parameters: <amount of test data> <file> <format>" );
			return;
		}
		
		int amount = Integer.parseInt(args[0]);
		File file = new File(args[1]);
		String format = args[2];
		
		if (file.exists()){
			System.out.println("File " + file + " exists, please remove it manually.");
			return;
		}
		
		List<ContactData> contacts = generateRandomContacts(amount);
		if ("csv".equals(format)) {
			saveContactsToCsvFile(contacts, file);
		} else if ("xml".equals(format)) {
			saveContactsToXmlFile(contacts, file);
		} else {
			System.out.println("Unknown format " + format);
		}
			return;
	}

	public static void saveContactsToXmlFile(List<ContactData> contacts, File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("contact", ContactData.class);
		String xml = xstream.toXML(contacts);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();		
	}
	public static List<ContactData> loadContactsFromXmlFile(File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("contact", ContactData.class);
		return (List<ContactData>)xstream.fromXML(file);
		} 
	
	
	public static void saveContactsToCsvFile(List<ContactData> contacts, File file) throws IOException {
		FileWriter writer = new FileWriter(file);
		for (ContactData contact : contacts) {
			writer.write(contact.getName()+ "," + contact.getLastname()+"," + contact.getEmail()+ ",!" + "\n");
		}
		writer.close();
	}	
	
	
	public static List<ContactData> loadContactsFromCsvFile(File file) throws IOException{
		List<ContactData> list = new ArrayList<ContactData>();
		FileReader reader = new FileReader(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String line = bufferedReader.readLine();
		while (line != null) {
			String[] part = line.split(",");
			ContactData contact = new ContactData()
					.withName(part[0])
					.withLastname(part[1])
					.withEmail(part[2]);
			list.add(contact);
			line = bufferedReader.readLine();
		}
		bufferedReader.close();
		return list;
	}

	

	public static List<ContactData> generateRandomContacts(int amount) {
		List<ContactData> list = new ArrayList<ContactData>();
		for (int i = 0; i < amount; i++)  {
			ContactData group = new ContactData()
			.withName(generateRandomString())
			.withLastname(generateRandomString())
			.withEmail(generateRandomString());
			list.add(group);
		}
		return list;
		
	}

	public  static String generateRandomString() {
		Random rnd = new Random();
		if (rnd.nextInt(3) == 0){
			return "";
		} else {
			return "test" + rnd.nextInt();
		}
		
	}

}
